JP2017175440A - Device, system and method for radio communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable simultaneous communication with an opposite party, communicable through a private radio channel, and an opposite party communicable through a public radio channel.SOLUTION: A radio communication device 3 includes: a first communication unit 11 which performs packet communication with another radio communication device through a private radio channel; a second communication unit 12 which performs packet communication with the other radio communication device through a public radio channel; and a communication control unit 13 which controls the packet communication by the first and second communication units 11, 12. At speech transmission or information transmission, the communication control unit 13 transmits each packet through both of the private radio channel and the public radio channel, whereas at speech reception or information reception, the communication control unit 13 controls packet communication by the first and second communication units 11, 12 in a manner to receive a packet through at least one of the private radio channel and the public radio channel.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wireless communication apparatus, a wireless communication system, and a wireless communication method that perform wireless communication via a private wireless line and a public wireless line.

  In recent years, the MCA (Multi-Channel Access) system, which allows multiple users to jointly use multiple prepared frequencies as a self-supporting wireless system that performs wireless communication via a self-supported wireless line, is used for transportation and logistics operations, bus operation Widely used in business and taxis. Since this MCA system uses a communication method in which a free frequency among a plurality of prepared frequencies is assigned to a user, a public wireless system that performs wireless communication using a predetermined specific frequency and Compared with this, there is an advantage that the frequency utilization efficiency is high. In addition, the MCA system is excellent as a communication means in an emergency or disaster because the coverage area per relay station is wide (radius of several tens of kilometers) and simultaneous broadcasting is possible.

  However, since the MCA system has a limited cover area compared to the public radio system, communication is disabled when the mobile station (wireless terminal) moves out of the communication area of the MCA system. Even if the mobile station is located within the communication area, communication may become impossible if radio conditions are bad, such as when radio waves are blocked by terrain or buildings. Therefore, a wireless communication system using a wireless terminal provided with a communication module for a private wireless line and a communication module for a public wireless line has been proposed (Patent Document 1). According to the technique described in Patent Document 1, either a private radio line or a public radio line is selected and used in accordance with the radio wave environment or the movement status of a wireless terminal.

Japanese Patent No. 5648096

  However, in the prior art described in Patent Document 1, since either a private wireless line or a public wireless line is selected and used, communication is established via a public wireless line with a partner capable of communicating via the private wireless line. It was not possible to communicate with both possible partners at the same time. If you can communicate simultaneously with both a partner that can communicate via a private wireless line and a partner that can communicate via a public wireless line, you are located outside the communication area of the MCA system It is very useful because wireless communication can be performed even when the wireless condition is bad and when the other party does not have the MCA system but only the public wireless system.

  The present invention has been devised in view of such problems of the prior art, and is applicable to both a partner that can communicate via a private wireless line and a partner that can communicate via a public wireless line. It is a main object to provide a wireless communication device, a wireless communication system, and a wireless communication method capable of performing simultaneous communication.

  A wireless communication device of the present invention is a wireless communication device that performs wireless communication via a private wireless line and a public wireless line, and performs packet communication with another wireless communication device via the private wireless line. A first communication unit, a second communication unit that performs packet communication with another wireless communication device via the public wireless line, and a communication that controls the packet communication performed by the first and second communication units. A control unit, wherein the communication control unit transmits the packet via both the private wireless line and the public wireless line at the time of transmission or information transmission, and the private management at the time of reception or reception of information. The packet communication by the first and second communication units is controlled to receive the packet via at least one of a wireless line and a public wireless line.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to communicate simultaneously with both the other party which can communicate via a private radio channel, and the other party which can communicate via a public wireless line.

Schematic diagram showing an example of a wireless communication system according to the present invention (A) Functional block diagram of a wireless communication apparatus according to the present invention included in the wireless communication system of FIG. 1, (B) Functional block diagram of a conventional wireless communication apparatus included in the wireless communication system of FIG. Sequence diagram for explaining the connection sequence Sequence diagram for explaining the transmission sequence within the MCA communication area Sequence diagram for explaining the transmission sequence outside the MCA communication area Sequence diagram for explaining the transmission sequence in the MCA dedicated machine Sequence diagram for explaining the cutting sequence Sequence diagram for explaining the MCA line connection refusal sequence Sequence diagram for explaining an IP line connection failure sequence Sequence diagram for explaining the connection refusal sequence of the other line during connection on one line

  A first invention made to solve the above-described problem is a wireless communication device that performs wireless communication via a private wireless line and a public wireless line, and the wireless communication device communicates with another wireless communication device via the private wireless line. A first communication unit that performs packet communication between the first communication unit, a second communication unit that performs packet communication with another wireless communication device via the public wireless line, and the first and second communication units. A communication control unit that controls the packet communication, and the communication control unit transmits the packet via both the private wireless line and the public wireless line during transmission or information transmission, The packet communication by the first communication unit and the second communication unit so as to receive the packet via at least one of the private wireless line and the public wireless line And controlling.

  According to the wireless communication device of the first invention, at the time of transmitting or transmitting information, the transmission or information is transmitted through both the private wireless line and the public wireless line, and at the time of receiving or receiving information, the self-supporting It is possible to receive or receive information via at least one of a wireless line and a public wireless line. As a result, it is possible to simultaneously communicate with both a partner that can communicate via the private wireless line and a partner that can communicate via the public wireless line.

  In the second invention, in the first invention, when the communication control unit receives the packet via both the private radio line and the public radio line at the time of receiving a call or receiving information, Control the packet communication by the first communication unit and the second communication unit so as to select any one of the packet received via a private wireless line and the packet received via the public wireless line It is characterized by doing.

  According to the wireless communication device of the second invention, even when both a private wireless line and a public wireless line are connected at the time of receiving a call or receiving information, by selecting one of them, the call can be received or received normally. Information can be received.

  In the third invention, in the second invention, the communication control unit is configured to transmit the wireless channel via a wireless channel in which the packet is not selected from the private wireless channel and the public wireless channel. The packet communication by the first communication unit and the second communication unit is controlled to transmit a dummy packet not including valid data to the communication control station.

  According to the wireless communication apparatus according to the third aspect of the present invention, when both a private wireless line and a public wireless line are connected, and one of the lines is used to receive or receive information, the other line Can be prevented from being disconnected due to the time limit of the no-call period.

  According to a fourth aspect of the present invention, there is provided wireless communication including the wireless communication apparatus according to any one of the first to third aspects, a communication control station for a private wireless line, and a communication control station for a public wireless line. System.

  Further, a fifth invention is a wireless communication method for performing wireless communication via a private wireless line and a public wireless line, with respect to other wireless communication devices via both the private wireless line and the public wireless line. A transmitting step for transmitting the packet, and a receiving step for receiving the packet from the other wireless communication device via at least one of the private wireless line and the public wireless line.

  In addition, in a sixth aspect based on the fifth aspect, when the packet is received via both the private wireless line and the public wireless line after the receiving step, via the private wireless line. The method further comprises a packet selection step of selecting one of the received packet and the packet received via the public wireless line.

  According to a seventh aspect, in the sixth aspect, after the packet selection step, the wireless line is connected via a wireless line in which the packet is not selected from the private wireless line and the public wireless line. The communication control station further includes a dummy packet transmission step of transmitting a dummy packet that does not include valid data.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing an example of a wireless communication system 1 according to the present invention. FIG. 2A is a functional block diagram of a wireless communication apparatus 3 according to the present invention included in the wireless communication system 1 of FIG. FIG. 2B is a functional block diagram of a conventional wireless communication device 4 included in the wireless communication system 1 of FIG. Below, the example which applied the radio | wireless communications system 1 which concerns on this invention to transportation and physical distribution business is demonstrated.

  As shown in FIG. 1, a wireless communication system 1 according to the present invention includes wireless communication devices 3A to 3C mounted on vehicles 2A to 2C performing transportation / distribution operations, and a wireless communication device mounted on a vehicle 2D. 4, a relay station 5 that is a communication control station for a public wireless line, and a base station 6 that is a communication control station for a private wireless line. Radio communication devices (hereinafter simply referred to as “communication devices”) 3A to 3C and 4 are mobile stations that move as the vehicles 2A to 2D move, and are a public radio channel relay station 5 and a private radio channel base station. 6 can communicate with each other via one or both. Note that the communication devices 3A to 3C and 4 can be installed in an office or the like. In this case, the communication devices 3A to 3C and 4 are command stations.

  In the present embodiment, an MCA (Multi-Channel Access) line is used as a private wireless line. Hereinafter, the relay station 5 of the private wireless line is referred to as an MCA relay station 5. In this embodiment, an IP (Internet Protocol) line is used as a public wireless line. Hereinafter, the base station 6 of the public wireless line is referred to as an IP base station 6. The MCA relay station 5 and the IP base station 6 relay the communication data (for example, voice data) transmitted from the communication devices 3A to 3C and 4 and distribute it to the other communication devices 3A to 3C and 4 that are designated. To do. The private wireless line and the public wireless line are not particularly limited, and may be lines other than the MCA line and the IP line as long as the present invention is applicable.

  The MCA relay station 5 has a communicable area 7 having a radius of several tens km (for example, 20 to 40 km). Hereinafter, the communicable area 7 of the MCA relay station 5 is referred to as an MCA communication area 7. The IP base station 6 is provided for each predetermined range in each region, and is connected to each other via the network 9 and the communication control server 10. Therefore, the IP base station 6 as a whole has a vast communicable area 8 having a population coverage rate of 99%. Hereinafter, the communicable area 8 of the IP base station 6 is referred to as an IP communication area 8.

  In the example of FIG. 1, there is one MCA relay station 5 and one MCA communication area 7. However, a configuration in which a plurality of MCA relay stations 5 are connected to each other via a network and a communication control device (not shown) may be used. . In the example of FIG. 1, the MCA communication area 7 is included in the IP communication area 8, but the range of the MCA communication area 7 is equal to or greater than the range of the IP communication area 8. Good. That is, the IP communication area 8 may be included in the MCA communication area 7.

  All of the vehicles 2 </ b> A to 2 </ b> D are located in the IP communication area 8. However, although the communication device 4 mounted on the vehicle 2D can perform communication via the MCA line (hereinafter referred to as “MCA communication”), communication via the IP line (hereinafter referred to as “IP communication”). Is not possible). The communication devices 3A to 3C mounted on the vehicles 2A to 2C can perform IP communication. The vehicles 2A, 2B, and 2D are located in the MCA communication area 7, but the vehicle 2C is located outside the MCA communication area 7. Therefore, the communication devices 3A, 3B, and 4 mounted on the vehicles 2A, 2B, and 2D can perform MCA communication, but the communication device 3C mounted on the vehicle 2C cannot perform MCA communication.

  As shown in FIG. 2A, the communication device 3 (3A to 3C) according to the present invention performs the first packet communication with other communication devices (3A to 3C, 4) via the MCA line. By the second communication unit 12 that performs packet communication between the communication unit 11 and the other communication devices (3A to 3C) via the IP line, and the first communication unit 11 and the second communication unit 12 A communication control unit 13 that performs overall control of packet communication and various operations of the communication device 3, and a first antenna 14 and a second antenna for wireless communication connected to the first communication unit 11 and the second communication unit 12, respectively. And an antenna 15.

  The first communication unit 11 has a known communication module capable of executing communication complying with the MCA communication method, and the second communication unit 12 executes communication complying with the IP communication method It has possible known communication modules. The first antenna 14 has a known configuration corresponding to the communication scheme of MCA communication, and the second antenna 15 has a known configuration corresponding to the communication scheme of IP communication.

  The communication control unit 13 includes a central processing unit (CPU) that centrally executes various types of information processing and peripheral device control based on a predetermined control program, a random access memory (RAM) that functions as a work area of the CPU, a CPU Is implemented by a ROM (Read Only Memory) or the like that stores data stored in the control program, and controls packet communication by the first communication unit 11 and the second communication unit 12 based on a predetermined communication control program.

  The communication control unit 13 transmits communication data (from both the MCA line and the IP line) from both the first and second communication units 11 and 12 (ie, via both the MCA line and the IP line) during transmission or information transmission by e-mail or the like. For example, packet communication by the first and second communication units 11 and 12 is controlled so as to transmit a packet storing a data fragment obtained by dividing audio data).

  The communication control unit 13 receives the packet by at least one of the first and second communication units 11 and 12 (that is, via at least one of the MCA line and the IP line) when receiving a call or receiving information by e-mail or the like. The packet communication by the first and second communication units 11 and 12 is controlled so as to be received. The received packet is restored to the original communication data by a predetermined method. In addition, when the communication control unit 13 receives a packet by both the first and second communication units 11 and 12 at the time of receiving or receiving information, the communication control unit 13 receives the packet received by the first communication unit 11 and the second Packet communication by the first and second communication units 11 and 12 is controlled so as to select any one of the packets received by the communication unit 12. Packets that are not selected may be discarded after a predetermined time.

  The selection of the packet when the packet is received by both the first and second communication units 11 and 12 may be performed according to the operation mode or the wireless state of the communication device 3. For example, when the communication device 3 is set to perform MCA communication preferentially, the first communication unit 11 selects the received packet and is set to perform IP communication preferentially. In this case, the second communication unit 12 selects the received packet. Further, the packet may be selected according to the wireless state of the communication device 3 or the communication quality (for example, packet error rate, transmission speed, etc.).

  As described above, the communication device 3 according to the present invention performs transmission or information transmission via both the MCA line and the IP line when transmitting or transmitting information, and transmits the MCA line and IP when receiving or receiving information. Receive or receive information via at least one of the lines. This makes it possible to simultaneously communicate with both a partner that can communicate via the MCA line and a partner that can communicate via the IP line.

  As shown in FIG. 2B, the conventional communication device 4 includes a first communication unit 11 that performs packet communication with other communication devices (3A to 3C) via the MCA line, A communication control unit 16 that performs overall control of packet communication by the communication unit 11 and various operations of the communication device 4, and a first antenna 14 for wireless communication connected to the first communication unit 11. The first communication unit 11 and the first antenna 14 are the same as the first communication unit 11 and the first antenna 14 of the communication device 3 shown in FIG. To do.

  Similar to the communication control unit 13, the communication control unit 16 functions as a central processing unit (CPU) that centrally executes various information processing and control of peripheral devices based on a predetermined control program, a work area of the CPU, and the like. It is realized by a RAM (Random Access Memory), a control program executed by the CPU, a ROM (Read Only Memory) that stores data, and the like, and controls packet communication by the first communication unit 11 based on a predetermined communication control program.

  The communication control unit 16 transmits a packet storing a data fragment obtained by dividing communication data (for example, voice data) at the time of transmission or information transmission by e-mail, and receives at the time of reception or reception of information by e-mail or the like. The packet communication by the first communication unit 11 is controlled so that the received packet is restored to the original communication data. Unlike the communication device 3, the communication device 4 does not include the second communication unit 12 and the second antenna 15. That is, the communication device 4 is an MCA dedicated machine capable of only MCA communication.

  Examples of each sequence such as a connection sequence, a transmission sequence, and a disconnection sequence of the wireless communication system 1 according to the present invention configured as described above will be described with reference to FIGS. 3 to 10 are sequence diagrams illustrating signal exchange between each of the communication devices 3A to 3C and 4, the MCA relay station 5, and the IP base station 6 in each sequence. The vertical axis in each figure corresponds to the time axis. In the following description, the signal transmission / reception control is performed by programs in the communication control units 13 and 16 of the communication apparatuses 3A to 3C and 4, the control unit (not shown) of the MCA relay station 5, and the control unit (not shown) of the IP base station 6. It shall be executed by processing.

(Connection sequence)
First, the connection sequence will be described with reference to FIG. Here, a case where the communication device 3A calls the communication devices 3B, 3C, and 4 will be described.

  At the start of this connection sequence, the communication devices 3A and 3B that are located within the MCA communication area 7 and are capable of both IP communication and MCA communication are in a standby state for both IP communication and MCA communication (hereinafter referred to as "the communication sequence"). , Referred to as “IP & MCA standby”). Further, the communication device 3 </ b> C that is located outside the MCA communication area 7 and can only perform IP communication is in a standby state for IP communication (hereinafter referred to as “IP standby”). Further, the communication device 4 that is an MCA dedicated machine and capable of only MCA communication is in a standby state for MCA communication (hereinafter referred to as “MCA standby”).

  First, the communication device 3A transmits a “connection request (MCA)”, which is a notification requesting connection of an MCA line, to the MCA relay station 5 in order to call the communication devices 3B, 3C, and 4 ( Step ST101). After transmitting the connection request (MCA), the communication device 3A waits for connection completion. When receiving the connection request (MCA) from the communication device 3A, the MCA relay station 5 notifies the communication devices 3A, 3B, and 4 capable of MCA communication of the connection of the MCA line based on the connection request from the communication device 3A. A “connection notification (MCA)” that is a notification is transmitted (step ST102). At this time, the connection request (MCA) is not transmitted to the communication device 3C incapable of MCA communication. The communication devices 3B and 4 that have received the connection notification (MCA) are in a state in which the MCA line is connected (hereinafter referred to as “MCA being connected”).

  Upon receiving a connection notification (MCA) from the MCA relay station 5, the communication device 3A transmits a “connection request (IP)” requesting connection of an IP line to the IP base station 6 (step ST103). ). After transmitting the connection request (IP), the communication device 3A waits for connection completion. When receiving the connection request (IP) from the communication device 3A, the IP base station 6 notifies the communication devices 3A, 3B, and 3C capable of IP communication of the connection of the IP line based on the connection request from the communication device 3A. “Connection notification (IP)” is transmitted (step ST104). At this time, the connection notification (IP) is not transmitted to the communication device 4 incapable of IP communication.

  The communication devices 3A and 3B that have received the connection notification (IP) are in a state where both the MCA line and the IP line are connected (hereinafter referred to as “IP & MCA being connected”). Further, the communication device 3C that has received the connection notification (IP) is in a state in which the IP line is connected (hereinafter referred to as “IP connection in progress”). Thereby, in the communication device 3A, both the MCA line and the IP line are connected to the communication device 3B, the IP line is connected to the communication device 3C, and the MCA line is connected to the communication device 4. It will be in the state.

(Transmission sequence within the MCA communication area)
Next, a transmission sequence in the area of the MCA communication area 7 performed following the above connection sequence (see FIG. 3) will be described with reference to FIG. Here, a case where the communication device 3A transmits will be described.

  At the start of this transmission sequence, communication devices 3A and 3B are in a standby state (hereinafter referred to as “IP & MIC idle”) for both MCA communication and IP communication. The communication device 4 is in a standby state (hereinafter referred to as “MCA idle”) with respect to the MCA line.

  First, the communication device 3A transmits a “transmission right request (IP)”, which is a notification requesting the transmission right of IP communication, to the IP base station 6 in order to acquire the transmission right of IP communication (step) ST201). Further, the communication device 3A transmits a “transmission right request (MCA)” that is a notification requesting the transmission right of the MCA communication to the MCA relay station 5 in order to acquire the transmission right of the MCA communication (Step S3). ST202).

  The IP base station 6 that has received the transmission right request (IP) from the communication device 3A notifies the communication devices 3A, 3B, and 3C capable of IP communication that the communication device 3A has acquired the right to transmit IP communication. "Transmission right notification (IP)" is transmitted (step ST203). The communication devices 3B and 3C that have received the transmission right notification (IP) enter “IP reception”, which is a state in which reception is possible through IP communication.

  On the other hand, the MCA relay station 5 that has received the transmission right notification (MCA) from the communication device 3A has acquired the transmission right of the MCA communication from the communication devices 3A, 3B, and 4 capable of MCA communication. A “transmission right notification (MCA)”, which is a notification to notify, is transmitted (step ST204). The communication device 3A that has received the transmission right notification (MCA) is in a state where it can transmit a voice by both IP communication and MCA communication (hereinafter referred to as “IP & MCA transmission in progress” state). In addition, the communication device 4 that has received the transmission right notification (MCA) is in “MCA reception”, which is a state in which reception is possible through MCA communication.

  The communication device 3B that has received the transmission right notification (MCA) selects either the IP call or the MCA call according to the operation mode or wireless state of the communication device. In the present embodiment, the communication device 3B is set to give priority to the IP call over the MCA call, and the IP call is selected. Therefore, the state of the communication device 3B does not change from during IP reception. Note that when the communication device 3B is set to give priority to the MCA call over the IP call, the MCA call is selected.

  Then, the communication device 3A transmits “voice (MCA)” that is voice data to the MCA relay station 5 (step ST205), and “voice (IP) that is voice data to the IP base station 6”. "Is transmitted (step ST206). The MCA relay station 5 that has received the voice (MCA) from the communication device 3A transmits the voice (MCA) to the communication devices 3B and 4 (step ST207). On the other hand, IP base station 6 that has received voice (IP) from communication device 3A transmits voice (IP) to communication devices 3B and 3C (step ST208). As a result, the communication device 3A can communicate with the communication devices 3B and 3C by IP communication, and can communicate with the communication device 4 by MCA communication.

  When the communication device 3A terminates the transmission and releases the transmission right, the communication device 3A notifies the MCA relay station 5 “transmission right release (MCA)”, which is a notification for releasing the transmission right of the MCA communication. Is transmitted (step ST209). Further, communication apparatus 3A transmits “transmission right release (IP)”, which is a notification for releasing the transmission right of IP communication, to IP base station 6 (step ST210).

  The MCA relay station 5 that has received the transmission right release (MCA) from the communication device 3A notifies the communication devices 3A, 3B, and 4 that the communication device 3A has released the transmission right for MCA communication. Notification (MCA) "is transmitted (step ST211). When the release notification (MCA) is received, the communication device 3A becomes IP & MCA idle, and the communication device 4 becomes MCA idle. The state of the communication device 3B does not change during IP reception.

  On the other hand, the IP base station 6 that has received the transmission right release (IP) from the communication device 3A is a notification informing the communication devices 3A, 3B, and 3C that the communication device 3A has released the transmission right for IP communication. “Release notification (IP)” is transmitted (step ST212). When the release notification (IP) is received, the communication device 3B becomes IP & MCA idle, and the communication device 3C becomes MCA idle.

(Transmission sequence outside MCA communication area)
Next, a transmission sequence outside the area of the MCA communication area 7 performed following the above-described transmission sequence within the area of the MCA communication area (see FIG. 4) will be described with reference to FIG. Here, a case where the communication device 3C transmits will be described. At the start of this transmission sequence, communication devices 3A and 3B are IP & MCA idle, communication device 3C is IP idle, and communication device 4 is MCA idle.

  First, the communication device 3C transmits a transmission right request (IP) to the IP base station 6 in order to acquire the transmission right (step ST301). The IP base station 6 that has received the transmission right request (IP) from the communication device 3C notifies the communication devices 3A, 3B, and 3C capable of IP communication that the communication device 3C has acquired the transmission right for IP communication. A transmission right notification (IP) is transmitted (step ST302). At this time, the transmission right notification (IP) is not transmitted to the communication device 4 incapable of IP communication. Thereafter, the state of the communication device 4 does not change from the MCA idle.

  When the transmission right notification (IP) is received, the communication devices 3A and 3B are in an IP reception state, and the communication device 3C is in a state in which the communication can be performed by IP communication (hereinafter referred to as “IP transmission”). Then, communication device 3C transmits voice (IP) to IP base station 6 (step ST303). The IP base station 6 that receives the voice (IP) from the communication device 3C transmits the voice (IP) to the communication devices 3A and 3B (step ST304). As a result, the communication device 3C can transmit to the communication devices 3A and 3B by IP communication.

  Even if only IP transmission is currently being performed, a transmission sequence within the MCA communication area may be performed after the IP communication is stopped, or a transmission sequence with an MCA dedicated device may be performed. Therefore, it is desirable to maintain MCA communication. However, the MCA communication is automatically disconnected when the non-communication period passes a predetermined period (for example, 5 seconds). Therefore, the communication device 3A that has made a communication call receives the transmission right notification from the MCA relay station 5 even after a predetermined period (for example, 1 second) has elapsed since the transmission right notification (IP) was received from the IP base station 6. If (MCA) (see FIG. 4) is not received, “dummy packet (MCA)”, which is a dummy packet not including valid data, is transmitted to MCA relay station 5 (step ST305). Transmission of the dummy packet (MCA) is continued at predetermined intervals until the state of the communication device 3A changes to IP & MCA idle.

  The MCA relay station 5 that has received the dummy packet (MCA) from the communication device 3A transmits a dummy packet (MCA) similar to the received dummy packet to the communication devices 3A, 3B, and 4 capable of MCA communication ( Step ST306). In this manner, since the dummy packets are transmitted and received between the communication devices 3A, 3B, and 4 and the MCA relay station 5, the MCA communication is maintained without being disconnected.

  When communication apparatus 3C terminates the transmission and releases the transmission right, communication apparatus 3C transmits a transmission right release (IP) to IP base station 6 (step ST307). The IP base station 6 that has received the transmission right release (IP) from the communication device 3C transmits a release notification (IP) to the communication devices 3A, 3B, and 3C (step ST308). When the release notification (IP) is received, the communication devices 3A and 3B become IP & MCA idle, and the communication device 3C becomes IP idle.

(Transmission sequence on MCA dedicated machine)
Next, a transmission sequence in the communication apparatus 4 that is a dedicated MCA machine, which is performed following the transmission sequence outside the MCA communication area (see FIG. 5), will be described with reference to FIG. At the start of this transmission sequence, communication devices 3A and 3B are IP & MCA idle, communication device 3C is IP idle, and communication device 4 is MCA idle.

  First, the communication device 4 transmits a transmission right request (MCA) to the MCA relay station 5 in order to acquire the transmission right (step ST401). The MCA relay station 5 that has received the transmission right request (MCA) from the communication device 4 notifies the communication devices 3A, 3B, and 4 capable of MCA communication that the communication device 4 has acquired the right to transmit MCA communication. A transmission right notification (MCA) is transmitted (step ST402). At this time, the transmission right notification (MCA) is not transmitted to the communication device 3C incapable of MCA communication. Thereafter, the state of the communication device 3C does not change from IP idle.

  When the transmission right notification (MCA) is received, the communication devices 3A and 3B are in the MCA reception state, and the communication device 4 is in a state capable of transmitting by the MCA communication (hereinafter referred to as “MCA transmission”). . Then, the communication device 4 transmits voice (MCA) to the MCA relay station 5 (step ST403). The MCA relay station 5 that has received the voice (MCA) from the communication apparatus 4 transmits the voice (MCA) to the communication apparatuses 3A and 3B (step ST404). As a result, the communication device 4 can transmit the communication to the communication devices 3A and 3B by MCA communication.

  Even if only the transmission by MCA communication is currently performed, the transmission sequence by IP communication may be performed after the transmission of MCA communication is stopped, or the transmission sequence may be performed outside the service area of the MCA communication area. Therefore, it is desirable to maintain IP communication. However, the IP communication is automatically disconnected when the non-communication period passes a predetermined period (for example, 5 seconds). Therefore, the communication device 3A that has made the communication call receives the transmission right notification from the IP base station 6 even after a predetermined period (for example, 1 second) has elapsed after receiving the transmission right notification (MCA) from the MCA relay station 5. If (IP) (see FIG. 4) is not received, “dummy packet (IP)”, which is a dummy packet not including valid data, is transmitted to IP base station 6 (step ST405). Transmission of the dummy packet (IP) is continued at predetermined intervals until the state of the communication device 3A changes to IP & MCA idle.

  The IP base station 6 that has received the dummy packet (IP) from the communication device 3A transmits a dummy packet (IP) similar to the received dummy packet to the communication devices 3A, 3B, and 3C capable of IP communication ( Step ST406). In this way, since the dummy packet is transmitted and received between the communication devices 3A, 3B, and 3C and the IP base station 6, the IP communication is maintained without being disconnected.

  When the communication apparatus 4 ends the transmission and releases the transmission right, the communication apparatus 4 transmits a transmission right release (MCA) to the MCA relay station 5 (step ST407). The MCA relay station 5 that has received the transmission right release (MCA) from the communication device 4 transmits a release notification (MCA) to the communication devices 3A, 3B, and 4 (step ST408). When the release notification (MCA) is received, the communication devices 3A and 3B become IP & MCA idle, and the communication device 4 becomes MCA idle.

(Cutting sequence)
Next, a disconnection sequence performed following the transmission sequence (see FIG. 6) in the MCA dedicated machine will be described with reference to FIG. Here, a case where the communication device 3A disconnects the MCA line and the IP line will be described. At the start of this disconnection sequence, the communication devices 3A and 3B are in IP & MCA connection, the communication device 3C is in IP connection, and the communication device 4 is in MCA connection.

  First, communication device 3A transmits “disconnection request (MCA)”, which is a notification requesting disconnection of the connection of the MCA line, to MCA relay station 5 (step ST501). Communication device 3A transmits “disconnection request (IP)”, which is a notification requesting disconnection of the IP line connection, to IP base station 6 (step ST502).

  The MCA relay station 5 that has received the disconnection request (MCA) from the communication device 3A “notification of disconnection (MCA)” that is a notification that notifies the communication devices 3A, 3B, and 4 capable of MCA communication of disconnection of the MCA line. Is transmitted (step ST503). At this time, the disconnection notification (MCA) is not transmitted to the communication device 3C incapable of MCA communication. On the other hand, the IP base station 6 that has received the disconnection request (IP) from the communication device 3A notifies the communication devices 3A, 3B, and 3C capable of IP communication of disconnection of IP communication “disconnection notification (IP ) "Is transmitted (step ST504). At this time, the disconnection notification (IP) is not transmitted to the communication device 4 incapable of IP communication.

  The communication devices 3A and 3B that have received the disconnection notification (MCA) and the disconnection notification (IP) enter the IP & MCA standby mode. The communication device 3C that has received the disconnection notification (IP) becomes IP standby. The communication device 4 that has received the disconnection notification (MCA) becomes MCA standby. Thereby, the cutting sequence is completed.

(Connection denial sequence of MCA line)
Next, an MCA line connection rejection sequence will be described with reference to FIG. Here, since the user of the communication device 3A is not a contractor of the communication service in the MCA communication area 7, the connection request (MCA) from the communication device 3A is rejected by the MCA relay station 5 in the connection sequence shown in FIG. The case where it will be described. In this embodiment, since the IP line is connected after the MCA line is connected (see FIG. 3), when the connection request for the MCA line is rejected, the IP line is connected. Absent.

  At the start of this connection rejection sequence, the communication devices 3A and 3B are in IP & MCA standby, the communication device 3C is in IP standby, and the communication device 4 is in MCA standby. First, the communication device 3A transmits a connection request (MCA) to the MCA relay station 5 in order to call the communication devices 3B, 3C, and 4 (step ST601). After transmitting the connection request (MCA), the communication device 3A waits for connection completion.

  The MCA relay station 5 that has received the connection request (MCA) from the communication device 3A, the user of the communication device 3A makes a contract for the communication service in the MCA communication area 7 based on the ID included in the received data from the communication device 3A. If it is determined that the user of the communication device 3A is not a contractor of the communication service in the MCA communication area 7, the connection request (MCA) from the communication device 3A is rejected. Here, since the user of the communication device 3A is not a contractor of the communication service in the MCA communication area 7, the MCA relay station 5 rejects the connection request (MCA) from the communication device 3A. Then, the MCA relay station 5 transmits a “connection rejection notification (MCA)” that is a notification notifying that the connection request for the MCA line is rejected to the communication device 3A (step ST602). The communication device 3A that has received the connection rejection notice (MCA) returns to the IP & MCA standby state. This completes the connection rejection sequence. In the example of FIG. 8, the communication device 3A is described as an example, but the same applies to the communication device 3B.

(IP line connection failure sequence)
Next, an IP line connection failure sequence will be described with reference to FIG. Here, a case will be described in which the connection request (IP) from the communication device 3A fails in the connection sequence shown in FIG. Here, a case where the IP communication function of the IP base station 6 is lost due to a disaster or an accident will be described.

  At the start of this connection failure sequence, the communication devices 3A and 3B are in IP & MCA standby, the communication device 3C is in IP standby, and the communication device 4 is in MCA standby. First, the communication device 3A transmits a connection request (MCA) to the MCA relay station 5 in order to call the communication devices 3B, 3C, and 4 (step ST701). After transmitting the connection request (MCA), the communication device 3A waits for connection completion. The MCA relay station 5 that has received the connection request (MCA) from the communication device 3A transmits a connection notification (MCA) to the communication devices 3A, 3B, and 4 capable of MCA communication (step ST702). The communication devices 3B and 4 that have received the connection notification (MCA) are in MCA connection.

  The communication device 3A that has received the connection notification (MCA) transmits a connection request (IP) to the IP base station 6 (step ST703). The IP base station 6 may be able to reply via the IP line even if the IP communication function is lost. In such a case, the IP base station 6 that has received the connection request (IP) from the communication device 3A cannot connect the IP line to the communication devices 3A, 3B, and 3C capable of IP communication ( That is, a “connection NG notification” that is a notification notifying that the IP communication function of the IP base station 6 has been lost) is transmitted (step ST704). When the IP base station 6 cannot reply via the IP line, the IP base station 6 does not respond.

  When the connection NG notification is received from the IP base station 6 or when there is no response from the IP base station 6 for a predetermined period, the communication device 3A is in MCA connection. The state of the communication device 3B does not change since the MCA is connected. Further, the state of the communication device 3C does not change from the IP standby. Thereby, the connection failure sequence of the IP line is completed. In the example of FIG. 9, the communication device 3A has been described as an example, but the same applies to the communication device 3B.

(Connection refusal sequence of the other line during connection on one line)
Next, a sequence for rejecting a connection request (interrupt) on the other line from a communication apparatus not connected to the wireless line when connected on one wireless line will be described with reference to FIG. To do. Here, when the communication device 4 which is an MCA dedicated line and the communication devices 3A and 3B are connected by the MCA line, the connection (interrupt) of the IP line to the communication devices 3A and 3B from the communication device 3C outside the MCA area ) Will be described.

  At the start of this IP line connection rejection sequence, the communication devices 3A and 3B are in IP & MCA standby, the communication device 3C is in IP standby, and the communication device 4 is in MCA standby. First, the communication device 4 transmits a connection request (MCA) to the MCA relay station 5 in order to call the communication devices 3A and 3B (step ST801). After transmitting the connection request (MCA), the communication device 4 waits for connection completion. The MCA relay station 5 that has received the connection request (MCA) from the communication device 4 transmits a connection notification (MCA) to the communication devices 3A, 3B, and 4 capable of MCA communication (step ST801). When the connection notification (MCA) is received, the communication devices 3A, 3B, and 4 become MCA connected.

  Next, communication device 3C transmits a connection request (IP) to IP base station 6 to call communication devices 3A and 3B (step ST803). The IP base station 6 that has received the connection request (IP) from the communication device 3C transmits a connection notification (IP) to the communication devices 3A, 3B, and 3C capable of IP communication (step ST804). The communication device 3C that has received the connection notification (IP) enters the IP connection state. However, the communication devices 3A and 3B that are already connected to the MCA reject the IP line connection (interrupt) from the communication device 3C and maintain the connection of the MCA line. Therefore, the state of the communication devices 3A and 3B does not change during the IP connection and is maintained during the MCA connection. This completes the IP line connection refusal sequence. In the example of FIG. 10, the example of the IP line interruption by the communication apparatus 3C when connected by the MCA line has been described. However, the interruption of the MCA line by the communication apparatus 4 when connected by the IP line is described. The same applies to the case.

  As mentioned above, although this invention was demonstrated based on specific embodiment, these embodiment is an illustration to the last, Comprising: This invention is not limited by these embodiment. In addition, all the components of the wireless communication device, the wireless communication system, and the wireless communication method are not necessarily essential, and can be appropriately selected as long as they do not depart from the scope of the present invention.

  A wireless communication device, a wireless communication system, and a wireless communication method according to the present invention simultaneously communicate with both a partner that can communicate via a private wireless line and a partner that can communicate via a public wireless line. It is useful as a wireless communication device, a wireless communication system, a wireless communication method, and the like that enable the communication.

1 Wireless communication system 2 Vehicle 3 Wireless communication device 4 Wireless communication device (MCA dedicated machine)
5 MCA relay station 6 IP base station 7 MCA communication area 8 IP communication area 9 Network 10 Communication control server 11 First communication unit 12 Second communication unit 13 Communication control unit 14 First antenna 15 Second antenna 16 Communication Control unit

Claims (7)

A wireless communication device that performs wireless communication via a private wireless line and a public wireless line,
A first communication unit that performs packet communication with another wireless communication device via the private wireless line;
A second communication unit that performs packet communication with another wireless communication device via the public wireless line;
A communication control unit that controls the packet communication by the first and second communication units,
The communication control unit transmits the packet via both the private wireless line and the public wireless line when transmitting or transmitting information, and the private wireless line and the public wireless line when receiving or receiving information. A wireless communication device that controls the packet communication by the first communication unit and the second communication unit so as to receive the packet via at least one of the above.   When the communication control unit receives the packet via both the private wireless line and the public wireless line at the time of receiving or receiving information, the communication control unit receives the packet and the public wireless line received via the private wireless line 2. The wireless communication apparatus according to claim 1, wherein the packet communication by the first communication unit and the second communication unit is controlled so as to select any one of the packets received via the wireless communication device. .   The communication control unit transmits a dummy packet that does not contain valid data to a communication control station of the wireless line via a wireless line in which the packet is not selected from the private wireless line and the public wireless line. The wireless communication apparatus according to claim 2, wherein the packet communication by the first communication unit and the second communication unit is controlled so as to transmit a message. A wireless communication apparatus according to any one of claims 1 to 3;
A communication control station of a private wireless line,
A wireless communication system including a public wireless communication control station. A wireless communication method for performing wireless communication via a private wireless line and a public wireless line,
A transmission step of transmitting a packet to another wireless communication device via both the private wireless line and the public wireless line;
And a reception step of receiving the packet from the other wireless communication device via at least one of the private wireless line and the public wireless line.   After the receiving step, when the packet is received via both the private wireless line and the public wireless line, the packet received via the private wireless line and the public wireless line is received. The wireless communication method according to claim 5, further comprising a packet selection step of selecting any one of the packets.   After the packet selection step, a dummy that does not contain valid data is transmitted to the communication control station of the wireless line via the wireless line in which the packet is not selected from the private wireless line and the public wireless line. The wireless communication method according to claim 6, further comprising a dummy packet transmission step of transmitting a packet.

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